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0. E. TIBBLES. FEED MOTION FOR SEWING MACHINES. No. 328,538. Patented 001;. 20, 1885.

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(No Model.) 3 SheetsSheet 3. C. E. TIBBLES. FEED MOTION FOR SEWING MACHINES.

Patented Oct. 20, 1885.

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UNITED STATES ATENT OFFICE.

CHARLES E. TIBBLES, CHICAGO, ILLINOIS, ASSIGNOR TO THE TIBBLES MANUFACTURING COMPANY, OF SAME PLACE.

FEED-MOTION FOR SEWING-MACHINES.

SPECIFICATION forming part of Letters Patent No. 328,538, dated October 20,1885.

Application filed March 5, 1885. Serial No. 157,788. (No model.)

To (ZZZ whom it may concern.-

Be it known that I, CHARLES E. TIBBLEs, of Chicago, in the county of Cook and State of Illinois, have invented certain Improvement-s in Feed-Motions for Sewing-Machines; and I hereby declare the following to be a full, clear, and exact description thereof, refence being bad to the accompanying drawings, in which Figure 1 is a bottom plan view of a sewingmachine bed-plate, showing my feed mechanism. Fig. 2 is a vertical sectional view on the line a: w of Fig. 1. Fig. 3 is a top plan of the feed-bar. Fig. 4 illustrates the operatingcams. Figs. 5, 6, and 7 are details to be referred to. Fig. Sis a perspective view of the bed-plate and machinery attached to it, looking toward the feed-bar.

My invention relates to feed-motions for sewing-machines, and constitutes improvements on Letters Patent Nos. 274,056 and 274,057, issued to Tibbles Sewing- Machine Company, assignee, March 13, 1883.

My invention consists in a novel device for changing the length of the movement of the feed-bar, and thereby changing the length of the stitch.

In order that those skilled in the art may make and use my invention, I will proceed to describe the manner in which I have carried it out.

In the said drawings, A is the base-plate of the machine. Bis the drivingshaft. C is the feed-bar. D is the shuttle-lever, and E is the wrist of the shuttle-lever crank.

The feed-bar is sustained near one end by the feedcams, and at the other end rests on a sliding block, F, which is sustained by aloop or hanger, b, having a length greater than the width of block F. A bracket, 5, keeps the feed-bar snug against the bed-plate rib. One side of a portion of block F is cut wedgeshaped, as seen from 2 to 3, and lies within a projecting piece, G, having a wedge-shaped recess, 4, conforming in angulation to the wedge-shaped block F, over which lies plate b, secured by bolts. In a squared portion of block F are two slotsa diagonal one, d, and a straight one, 6. Through the straight slot passes a headed screw or pin, f, securing the block F to the feed-bar, and yet allowing a free movement of the block back and forth through the medium of the slot 6.

The feed-bar C, I make hollow, (see Fig. 2,) so as to combine strength and lightness. Near one end of this hollow or skeleton feed-bar is a slot, 9, cut through the lower side of the shell, through which projects and in which slides the movable depending arm h, which is one of the contacts for the feed-bar cam to strike. Within the hollow feed-bar a rod, 13, connects the depending arm h with a pin or screw, 70, which passes out through a slot, Z, and projects into the diagonal slot d in the block F. The block F is connected with a rod, H, which may pass nearly to the end of the bed-plate, where it is connected by a universal joint to a block, I, through which passes a set-screw, K, having a fixed bearing at K, so as to move the block I back and forth.

The movement of bar H and block F must be at a right angle to the feed-bar, because of the straight slot 6, and as the block moves the screw or pin is, by bearing against the angular face of slot d, is moved up or down the incline of the slot, and thereby is moved the interior rod, a, which carries the arm or contact In and in turn moves the said contact to or from the stationary contact h, thereby increasing and diminishing the throw of the feed-bar.

To prevent the momentum of the feed-bar from carrying it beyond the actual throw of the cam, I provide the wedge-shaped end of block F, resting in the angular socket in block G, the angular face of the end of block F, and the angular face 2 3 of the socket, and slot d, all having the same pitch. Thus the movement of the contact h by the diagonal slot and pin is is always synchronous with the movement of the diagonal face 2 3, and the space between said face and the diagonal face of the socket in block G corresponds with the desired length of movement of the feed-bar.

The upward motion of the feed-bar is produced by means of the cam-face, Fig. 4, cut for that purpose, while the bar is thrown down by a coiled spring, 10.

Having thus described my invention, what I claim, and desire to secure by Letters Patent, is

1. The block F, having slot 6 and wedgeshaped pe 'tion 2 3,'and means, substantially as descfibed; for-operating the same, incom- F, asset forth. 1

bination with projecting piece G, provided with a wedge-shaped recess, 4, and the feedbar 0, substantially as and for the purpose described.

2. vThe cam and the feed-bar 0, provided with the movable dependingarm h and interior bar, 6, in combination with block F, pro- [0 vided with the'diagonal slot d, and means,

3. A hollow feed-bad", 0, in ceinbination with the movable arm h, interior bar, 73, and

means, substantially as described, for moving 1 said bar, substantially as set forth.

v -OHARLES E. TIBBLES.

Witnesses:

F. A. ELLSWORTH, T. O. BREOHT. V 

